var net = require('net');
var port = 4000;
var quitting = false;
var conn;
var retryTimeout = 3000;  //三秒，定义三秒后重新连接
var retriedTimes = 0;  //记录重新连接的次数
var maxRetries = 10;  //最多重新连接十次
process.stdin.resume(); 
//process.stdin流来接受用户的键盘输入，这个可读流初始化时处于暂停状态，调用流上的resume()方法来恢复流
process.stdin.on('data', function(data){
  if (data.toString().trim().toLowerCase() === 'quit'){
    quitting = true;
    console.log('quitting');
    conn.end();
    process.stdin.pause();
  } else {
    conn.write(data);
  }
});
//连接时设置最多连接十次，并且开启定时器三秒后再连接
(function connect() {
  function reconnect() {
    if (retriedTimes >= maxRetries) {
      throw new Error('Max retries have been exceeded, I give up.');
    }
    retriedTimes +=1;
    setTimeout(connect, retryTimeout);
  }
  conn = net.createConnection(port);
  conn.on('connect', function() {
    retriedTimes = 0;
    console.log('connect to server');
  });
  conn.on('error', function(err) {
    console.log('Error in connection:', err);
  });
  conn.on('close', function() {
    if(! quitting) {
      console.log('connection got closed, will try to reconnect');
      reconnect();
    }
  });
  //打印
  conn.pipe(process.stdout, {end: false});
})();